Breakup time scale studied in the 8 GeV/c pi- + 197Au reaction

L. Pienkowski; K. Kwiatkowski; T. Lefort; W. -c. Hsi; L. Beaulieu; A. Botvina; B. Back; H. Breuer; S. Gushue; R. G. Korteling; R. Laforest; E. Martin; E. Ramakrishnan; L. P. Remsberg; D. Rowland; A. Ruangma; V. E. Viola; E. Winchester; S. J. Yennello

arXiv · nucl-ex/0009012

Breakup time scale studied in the 8 GeV/c pi- + 197Au reaction

L. Pienkowski·K. Kwiatkowski·T. Lefort·W. -c. Hsi·L. Beaulieu·A. Botvina·B. Back·H. Breuer·S. Gushue·R. G. Korteling·R. Laforest·E. Martin·E. Ramakrishnan·L. P. Remsberg·D. Rowland·A. Ruangma·V. E. Viola·E. Winchester·S. J. Yennello

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Abstract

Experimental data from the reaction of an 8.0 GeV/c pi- beam incident on a 197Au target have been analyzed in order to investigate the integrated breakup time scale for hot residues. Alpha-particle energy spectra and particle angular distributions supported by a momentum tensor analysis suggest that at large excitation energy, above 3-5 MeV/nucleon, light-charged particles are emitted prior to or at the same time as the emission of the heavy fragments. Comparison with the SMM and GEMINI models is presented. A binary fission-like mechanism fits the experimental data at low excitation energies, but seems unable to reproduce the data at excitation energies above 3-5 MeV/nucleon.

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L. Pienkowski, K. Kwiatkowski, T. Lefort, W. -c. Hsi, L. Beaulieu, A. Botvina, B. Back, H. Breuer, S. Gushue, R. G. Korteling, R. Laforest, E. Martin, E. Ramakrishnan, L. P. Remsberg, D. Rowland, A. Ruangma, V. E. Viola, E. Winchester, S. J. Yennello. 2000-09-16. Breakup time scale studied in the 8 GeV/c pi- + 197Au reaction. https://arxiv.org/abs/nucl-ex/0009012

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